GABA (Singular Free Form Amino Acid) by NuMedica is a naturally occurring amino acid classified as a neurotransmitter. It is the most important and abundant inhibitory neurotransmitter in the brain. It helps induce relaxation and sleep.

Caution:
GABA should not be taken during the day or at any time other than
prior to sleep. (Some individuals may experience minor tingling of the
skin and/or a slight shortness of breath shortly after taking GABA. This
is a characteristic of this amino acid and quickly subsides.) It will
not work unless followed by sleep, plus it may cause drowsiness. Keep
out of reach of children.